Plaster-lath.



i gLuNiTED sTATiis PATENT orricn.

JAMES P. sEXToN, or Los ANGELES, CALIFORNIA, AssIeNoR To BUTTONLATH MANU- I l* FACTURING COMPANY, A conroieA'rioN or cALIronNrA.

PLASTER-LATH.

f7?) allfwlwm t may concern f ABeit known that I, JAMES P. SEX'roN, a citizen of the United States, residing at Los f i-ifngele's', 'in the county of Los Angeles, State of California, have invented new and 't useful Improvements in Plaster-Lath, of-

i which the following is a specification.

\ This invention relates toiinprovements in A'plaster lath, being particularly an improve- 10, nient upon the plaster latli shown, described `and Jclaimed in my Patent No. 1,115,593,

dated Nov. 3rd, 1914:; `and the present infvcntion consists in certain specific particulars of construction hereinafter pointed out. i

liability. of the plaster breaking from its bond to vthe lath orof any part of the finished structure.breaking down in any man' a The details of construction attaining these objects are specifically set forth herein.

A preferred form of the plaster lath `and "j theaiiethod are explained herein; and other Aobjects and advantages will be apparent from this specification.

The drawings show preferred forms of my plaster lath and illustrate a preferred form of my method` which is described in this specicatiom In these drawings, Figure 1 is a transverse section showing my improved plaster lath7 Fig. 2 is a face view of the same, Fig.

3 is a similar transverse section showing a double faced form of plaster lath, and. Fig. 4 -is adiagram illustrating my preferred method of procedure to produce this plaster lath.

I first explain my preferred form of,l

plaster lath and then explain my method of production.

In the drawings I have illustrated a` ceinentitious body at 10, said cementiti'ous body being preferably confined between two forni members 11 and 12, said form inein-l Speccation of Letters Patent.

the circular 18. The button isl preferably dovetailed iny Patented Nov. 21, 19:16.

y Application ed .Tune 28, 1915. Serial No. 36,657.

bers being face sheets for the cenientitious body 10. In the` forni shown in Fig. 1 theA form member or face sheet 11 is 4plain and imperforate, while in the forni shown in Fig. 3, both face sheets 1-2 and 11a are shown in identical form, which is hereinafter described, to ymake a double faced plaster latli tion and have sloping sides 16, as is clearly i and 8. In the bottoms of shown in Figs. 1 these, depressions there are perforations 17 through the face sheet, preferably circular and preferably centrally located in the defr pressions. The body l() extends through perforations 16 to form buttons section, las shown in Figs. 1 and 3, and preferably overhangs the edges of the apertures 17', as is illustrated at 19. The button performs primarily the oiiice'of affording a key-shaped member around which applied plaster is set, the applied plaster setting under the overhanging edgeQ-O of the but- -ton so as to form a mechanical bond between the plaster latli and t-heapplied superimposed plaster, The overlianging of the but ton over the edges of the aperture 17 also performs the ofiice of mechanically locking the vface sheet 1:2 onto the cementitious body 10.

It will be particularly noted vthat the radial space between the overhanging edge 2() of the button and the periphery of the depression is comparatively wide, so as to allow the entry of aflaige section of applied plaster` to the space immediately around the button.l This produces a strong co'i'istruction in which the plasteris not liable to fall awayfrom the plaster lath, It will also/be noted that the construction of the depressions with their slopingv sides offers an opening for the applied plaster of' such shape that there are no points of reduced cross section of the applied plaster around the buttons 18.

In the form shown in Fig. 3, the depression and button formation is duplicated on v'the opposite side of the lath, providing a construction which will take pl a ster on both sides and thus providing means for making after set forth.

pressions in such forni as to resist deforina tion. I form a bead 21 around the aperture 17 and this bead sti'ens the bottom against displacement or deformation. f

My preferred proceduie for the manufacture of this plaster latli is illustrated by diagram in Fig. 4. (I do not herein attempt to illustrate my complete machinery for carryv ing my method into effect, but only to illustrate broadly the method itself). A fiat A member 30, such as a belt, may be made to move horizontally over drums, such as shown at 31. The face sheet 12 is laid face downward on this fiat member as shown. It may be fed onto belt 30 from a roll, or in 'anyother manner. The body 10 is applied over the face sheet, as at 10"L and the back sheet 11 is then applied. All these operations inay take place continuously and siinultaneously, the two sheets being laid from rolls and the cementitious substance for the base being continuouslyapplied on the face sheet 12. Immediately the cementitious substance is applied it passes through the perfoiatioiis 17 as shown at the right in Fig. 4 and the escape of air from the iecess 15y is thusA shut oil", itbeing understood that the edges of the recess contact all around with the belt or` other flat member BO. The air is entrapped in the recess; and this entrapped air, together with the stiffness of the recess bottom, prevents displacement or deformation of the recess bottom. This is an important feature in view of the fact that some pressure must be applied to the body to -form it into a uniform layer. This is done by passing under such a member as a roller 32, the distance between the roller andv the belt 30 deterinining'the finished thickness of the plaster lath. The cementitious substance is made of such fluidity that vit runs and is pressed through the perforations by just the correct amount to form buttons in the shape herein shown. The dovetailed shape of the buttons is made when the cementitious substance `of the button is pressed down'on the fiat base, flattening or expanding the substance at its base, (its outer end) and thereby forming it as shown. At the same time, and by the same action, the button, asv

a whole, is made of larger diameter than the perforation through which the cementitious substance has run. As a result of this siniv ple continuous operation the plaster lath is continuously produced in uniform quality. The buttons may vary slightly as' to their exact contour but they are generallyv imiissy form, of the dovetailed section and of thesize andshape shown.

Having described a preferred form of my invention, I claim:

1. A 'plaster lath, embodying a face sheet having circular depressions of relatively large diameter and small depth and having sloping sides, and having circularperforations at the bottoms of-said depressions, and a cementitious base back of said face sheet, said base projecting .through the perforations to form a protrusion in each depression, and said' protrirsion Vat its periphery clenching over the edges of the perforation` 2. A plaster lath, embodying a face sheet having circular depressions of relatively large diameter and small depth and having sloping sides, and having circular -perforations at the bottoms of saidvdepressions, kand having a 'reinforcing bead formed in the sheet around the edge of each aperture in each depression, and a cementitiousr base back of said face sheet, said base projecting through the perforations to form a protru- "son in said depression, and saidl protrusion at its periphery clenching over the edge of the perforation and ov'er said bead.

- In witness that I `claim the foregoing I i have hereunto subscribed my name this 18th y day of June, 1915. p.

JAMES P. SEXTON. Witnesses:

- JAMES T. Bulimia-iw,

ELwooD H. Baexem-iw; 

